Patents by Inventor Jun Azuma
Jun Azuma has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20200026207Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3) disposed directly or indirectly on the conductive substrate (2). The photosensitive layer (3) has a charge generating layer (3a) and a charge transport layer (3b) disposed in order from the conductive substrate (2). The charge generating layer (3a) contains a charge generating material. The charge transport layer (3b) contains a charge transport material, a binder resin, and a pigment that absorbs light having an irradiation wavelength. The binder resin includes a polyarylate resin including a repeating unit represented by general formula (1): In general formula (1), X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1).Type: ApplicationFiled: December 28, 2017Publication date: January 23, 2020Applicant: KYOCERA Document Solutions Inc.Inventors: Kensuke OKAWA, Seiki HASUNUMA, Jun AZUMA
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Publication number: 20190384190Abstract: A bis-butadiene derivative is represented by general formula (1) shown below. In general formula (1), Ra, Rb, and Rc each represent, independently of one another, an alkyl group having a carbon number of at least 1 and no greater than 8 or an alkoxy group having a carbon number of at least 1 and no greater than 8. l and m each represent, independently of one another, an integer of at least 0 and no greater than 5. n represents an integer of at least 0 and no greater than 4. Chemical groups Ra may be the same as or different from each other. Chemical groups Rb may be the same as or different from each other. Chemical groups Rc may be the same as or different from each other.Type: ApplicationFiled: June 17, 2019Publication date: December 19, 2019Applicant: KYOCERA Document Solutions Inc.Inventors: Jun AZUMA, Kensuke KOJIMA
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Patent number: 10509309Abstract: A polyarylate resin is represented by general formula (1) shown below. In general formula (1), R1 represents a hydrogen atom or methyl group. R2 and R3 each represent a hydrogen atom or an alkyl group having a carbon number of at least 1 and no greater than 4. R2 and R3 are not the same as one another. When R1 represents a hydrogen atom, R2 and R3 are not bonded to one another. When R1 represents a methyl group, R2 and R3 are optionally bonded to one another to form a ring. r and s each represent a number greater than or equal to 0 and less than or equal to 49. t and u each represent a number greater than or equal to 1 and less than or equal to 50. r+s+t+u=100. r+t=s+u.Type: GrantFiled: February 20, 2018Date of Patent: December 17, 2019Assignee: KYOCERA Document Solutions Inc.Inventor: Jun Azuma
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Publication number: 20190354027Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer (3) is a single-layer photosensitive layer (3c) and contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin includes a polyarylate resin represented by general formula (1). In general formula (1), Q1, Q2, Q3, and Q4 each represent a methyl group or a hydrogen atom. r, s, t, and u each represent a number greater than or equal to 15 and less than or equal to 35.Type: ApplicationFiled: November 30, 2017Publication date: November 21, 2019Applicant: KYOCERA Document Solutions Inc.Inventors: Tomofumi SHIMIZU, Jun AZUMA, Keiji MARUO
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Publication number: 20190354029Abstract: A method for producing an electrophotographic photosensitive member includes an electrically conductive substrate and a photosensitive layer. The method includes applying an application liquid for photosensitive layer formation containing a solvent, a binder resin, and a hole transport material directly or indirectly onto the electrically conductive substrate, and removing a portion of the solvent, to form the photosensitive layer. The solvent contains a first solvent that is an alcohol having a carbon number of at least 1 and no greater than 3, and a second solvent other than the first solvent.Type: ApplicationFiled: May 14, 2019Publication date: November 21, 2019Applicant: KYOCERA Document Solutions Inc.Inventors: Jun AZUMA, Tomofumi SHIMIZU, Kenji KITAGUCHI, Kiichiro OJI
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Publication number: 20190354028Abstract: A method of manufacturing an electrographic photoreceptor provided with a conductive substrate and a single-layered photosensitive layer is disclosed. The method includes: directly or indirectly applying a coating liquid for photosensitive layer formation onto the conductive substrate, the coating liquid containing a solvent, a charge generating agent, a binder resin, a hole transport material and an electron transport material; and removing part of the solvent to form the single-layered photosensitive layer. The solvent includes a first solvent as an alcohol with 1 to 3 carbon atoms and a second solvent as a solvent other than the first solvent. The binder resin includes a polyarylate resin as a polymerized product of monomers including a first monomer represented by General Formula (1) below and a second monomer represented by General Formula (2) below. The electron transport material includes a compound represented by General Formula (31), (32), (33) or (34) below.Type: ApplicationFiled: May 2, 2019Publication date: November 21, 2019Applicant: KYOCERA Document Solutions Inc.Inventors: Tomofumi SHIMIZU, Jun AZUMA
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Publication number: 20190332023Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer (3) is a single-layer photosensitive layer (3c) and contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin includes a polyarylate resin represented by general formula (1). In general formula (1), Q1, Q2, Q3, and Q4 each represent a methyl group or a hydrogen atom. r, s, t, and u each represent a number greater than or equal to 15 and less than or equal to 35.Type: ApplicationFiled: November 30, 2017Publication date: October 31, 2019Applicant: KYOCERA Document Solutions Inc.Inventors: Tomofumi SHIMIZU, Keiji MARUO, Jun AZUMA
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Publication number: 20190310562Abstract: A photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer is a single-layer photosensitive layer (3c). The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The hole transport material includes a triphenylamine derivative represented by general formula (HT). The electron transport material includes a compound represented by general formula (ET1), (ET2), (ET3), (ET4), or (ET5).Type: ApplicationFiled: August 24, 2017Publication date: October 10, 2019Applicant: KYOCERA Document Solutions Inc.Inventors: Hiroki TSURUMI, Eiichi MIYAMOTO, Jun AZUMA
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Publication number: 20190270846Abstract: A polyarylate resin is represented by general formula (1) shown below. In general formula (1), R1, R2, R3, and R4 each represent, independently of one another, a hydrogen atom or a methyl group. r and s each represent an integer of at least 0 and no greater than 49. t and u each represent an integer of at least 1 and no greater than 50. r+s+t+u=100. r+t=s+u. r and t may be the same as or different from each other. s and u may be the same as or different from each other. X represents a divalent group represented by chemical formula (2A), (2B), (2C), or (2D). Y represents a divalent group represented by chemical formula (4A), c (4B), or (4C). X and Y are different from each other.Type: ApplicationFiled: September 25, 2017Publication date: September 5, 2019Applicant: KYOCERA Document Solutions Inc.Inventors: Jun AZUMA, Kenji KITAGUCHI
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Patent number: 10379451Abstract: A polyarylate resin includes at least one type of repeating unit represented by a general formula (1), at least one type of repeating unit represented by a general formula (2), and a terminal group represented by a general formula (3). R1, R2, R3, and R4 each represent, independently of one another, a hydrogen atom or a methyl group. R5 and R6 each represent, independently of each other, a hydrogen atom or a C1-4 alkyl group. R5 and R6 may bond together to represent a C5-7 cycloalkylidene group. X1 represents a divalent group represented by a chemical formula (2A), (2B), (2C), or (2D) with the proviso that when only one type of repeating unit represented by the general formula (2) is included, X1 does not represent a divalent group represented by the chemical formula (2D). Rf represents a chain aliphatic group having at least one fluoro group.Type: GrantFiled: February 26, 2018Date of Patent: August 13, 2019Assignee: KYOCERA Document Solutions Inc.Inventors: Jun Azuma, Kensuke Okawa, Akihiko Ogata, Kenji Kitaguchi, Tomofumi Shimizu
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Patent number: 10372048Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer includes a charge generating layer and a charge transport layer. The charge generating layer contains a charge generating material. The charge transport layer contains a hole transport material and a binder resin. The charge transport layer further contains an electron acceptor compound. The hole transport material includes a compound represented by general formula (1). In general formula (1), R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10 each represent, independently of one another, a hydrogen atom or a methyl group.Type: GrantFiled: July 16, 2018Date of Patent: August 6, 2019Assignee: KYOCERA Document Solutions Inc.Inventors: Jun Azuma, Kensuke Kojima, Tomofumi Shimizu
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Patent number: 10359713Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer having a single-layer structure. The photosensitive layer contains a charge generating material, an electron transport material, and a binder resin. The electron transport material includes a compound having a halogen atom and represented by a general formula (1), (2), (3), (4), or (5). The binder resin includes a polyarylate resin. The polyarylate resin includes at least one type of repeating unit each represented by general formula (11), at least one type of repeating unit each represented by general formula (12), and a terminal group represented by general formula (13). In general formula (13), Rf represents a chain aliphatic group substituted by at least one fluoro group. A charge of calcium carbonate charged by friction between the photosensitive layer and the calcium carbonate is at least +8.0 ?C/g.Type: GrantFiled: April 9, 2018Date of Patent: July 23, 2019Assignee: KYOCERA Document Solutions Inc.Inventors: Tomofumi Shimizu, Jun Azuma
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Patent number: 10295918Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin contains a polyarylate resin (1). The polyarylate resin is represented by general formula (1). The photosensitive layer has a scratch resistance depth of no greater than 0.50 ?m. The photosensitive layer has a Vickers hardness of at least 17.0 HV.Type: GrantFiled: August 3, 2017Date of Patent: May 21, 2019Assignee: KYOCERA Document Solutions Inc.Inventors: Tomofumi Shimizu, Keiji Maruo, Jun Azuma
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Patent number: 10273331Abstract: A polyarylate resin is represented by general formula (1) shown below. In general formula (1), R1 and R2 each represent, independently of one another, a hydrogen atom or a methyl group. r and s each represent an integer of at least 0 and no greater than 49. t and u each represent an integer of at least 1 and no greater than 50. r+s+t+u=100. r+t=s+u. X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1), chemical formula (1-2), chemical formula (1-3), or chemical formula (1-4). X and Y are different from one another.Type: GrantFiled: November 28, 2017Date of Patent: April 30, 2019Assignee: KYOCERA Document Solutions Inc.Inventors: Jun Azuma, Kenji Kitaguchi, Kensuke Okawa, Seiki Hasunuma, Tomofumi Shimizu
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Patent number: 10191397Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin contains a polyarylate resin. The polyarylate resin is represented by general formula (1). The hole transport material contains a compound represented by general formula (HTM1), (HTM2), (HTM3), (HTM4), (HTM5), (HTM6), or (HTM7). The photosensitive layer has a scratch resistance depth of no greater than 0.50 ?m. The photosensitive layer has a Vickers hardness of at least 17.0 HV.Type: GrantFiled: August 4, 2017Date of Patent: January 29, 2019Assignee: KYOCERA Document Solutions Inc.Inventors: Keiji Maruo, Tomofumi Shimizu, Jun Azuma
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Publication number: 20190025720Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer includes a charge generating layer and a charge transport layer. The charge generating layer contains a charge generating material. The charge transport layer contains a hole transport material and a binder resin. The charge transport layer further contains an electron acceptor compound. The hole transport material includes a compound represented by general formula (1). In general formula (1), R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10 each represent, independently of one another, a hydrogen atom or a methyl group.Type: ApplicationFiled: July 16, 2018Publication date: January 24, 2019Applicant: KYOCERA Document Solutions Inc.Inventors: Jun AZUMA, Kensuke KOJIMA, Tomofumi SHIMIZU
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Publication number: 20180299797Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer having a single-layer structure. The photosensitive layer contains a charge generating material, an electron transport material, and a binder resin. The electron transport material includes a compound having a halogen atom and represented by a general formula (1), (2), (3), (4), or (5). The binder resin includes a polyarylate resin. The polyarylate resin includes at least one type of repeating unit each represented by general formula (11), at least one type of repeating unit each represented by general formula (12), and a terminal group represented by general formula (13). In general formula (13), Rf represents a chain aliphatic group substituted by at least one fluoro group. A charge of calcium carbonate charged by friction between the photosensitive layer and the calcium carbonate is at least +8.0 ?C/g.Type: ApplicationFiled: April 9, 2018Publication date: October 18, 2018Applicant: KYOCERA Document Solutions Inc.Inventors: Tomofumi SHIMIZU, Jun AZUMA
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Publication number: 20180246424Abstract: A polyarylate resin includes at least one type of repeating unit represented by a general formula (1), at least one type of repeating unit represented by a general formula (2), and a terminal group represented by a general formula (3). R1, R2, R3, and R4 each represent, independently of one another, a hydrogen atom or a methyl group. R5 and R6 each represent, independently of each other, a hydrogen atom or a C1-4 alkyl group. R5 and R6 may bond together to represent a C5-7 cycloalkylidene group. X1 represents a divalent group represented by a chemical formula (2A), (2B), (2C), or (2D) with the proviso that when only one type of repeating unit represented by the general formula (2) is included, X1 does not represent a divalent group represented by the chemical formula (2D). Rf represents a chain aliphatic group having at least one fluoro group.Type: ApplicationFiled: February 26, 2018Publication date: August 30, 2018Applicant: KYOCERA Document Solutions Inc.Inventors: Jun AZUMA, Kensuke OKAWA, Akihiko OGATA, Kenji KITAGUCHI, Tomofumi SHIMIZU
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Publication number: 20180246402Abstract: A polyarylate resin is represented by general formula (1) shown below. In general formula (1), R1 represents a hydrogen atom or methyl group. R2 and R3 each represent a hydrogen atom or an alkyl group having a carbon number of at least 1 and no greater than 4. R2 and R3 are not the same as one another. When R1 represents a hydrogen atom, R2 and R3 are not bonded to one another. When R1 represents a methyl group, R2 and R3 are optionally bonded to one another to form a ring. r and s each represent a number greater than or equal to 0 and less than or equal to 49. t and u each represent a number greater than or equal to 1 and less than or equal to 50. r+s+t+u=100. r+t=s+u.Type: ApplicationFiled: February 20, 2018Publication date: August 30, 2018Applicant: KYOCERA Document Solutions Inc.Inventor: Jun AZUMA
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Patent number: 10031431Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer contains at least a charge generating material, a charge transport material, and a binder resin. The binder resin includes a polyarylate resin. The polyarylate resin is represented by general formula (1) shown below. In general formula (1), X represents a divalent group represented by chemical formula (1-1), (1-2), (1-3), or (1-4) shown below.Type: GrantFiled: April 20, 2017Date of Patent: July 24, 2018Assignee: KYOCERA Document Solutions Inc.Inventors: Jun Azuma, Takahiro Oki, Kensuke Okawa, Akihiko Ogata